Improvement in hot-air furnaces



UNITED STATES WILLIAM O. GROVER, OF BOSTON, MASSACHUSETTS.

IMPROVEMENT IN HOT-AIR FURNACES.

Specification forming part of Letters Patent No. 139,505, dated June 3,1873;'ap'pl1cation filed l February 14, 1873.

. To all whom it may concern:

Be it known that I, WILLIAM O. GROW/ER, of Boston, in the county ofSuiolk and State of Massachusetts, have invented'an Improved Hot-AirFurnace; and I do hereby'declare` l With radiator pipes and dome throughWhich the flames and smoke pass, the cold air being admitted into thechamber formed by the brickwork and surrounding such structure, andbeing heated by contact with the radiating surfaces and beingdisseminated or distributed through suitable hot-air pipes to the rooms-to be heated. Not only are these castiron plates themselves more orless pervious to passage ofcarbonic-acid gas directly through them, butthe joints between therespective parts are always more or lessimperfect, and, notwithstandiugall possible precaution, deleterious gasescapes and mingling with the hot air is thrown into the looms to theinjury of all persons who may breathe the air thus contaminated. Myinvention is designed not only to obviate these objections, but tofurnish a construction in which the lire-pot, ash-pit, and grate may bereadily dismembered and access had to the smoke and iiame chamber. Forthis purpose I make the furnace in two entirely separate and distinctparts, there being rst a lire-pot and ash-pit (relatively separable) andnext a large chamber, in the front part of which the lire-pot is placed,the tirepot opening at top directly into the chamber, and it and theash-pit into door-spaces in the front Wall of the chamber, whilethevvalls of the large smoke and llame chamber surround the lire-pot,and are many times larger, the chamber having a suitable flue-outlet,and the air to support combustion being introduced through suitableregisters in the doors of the chamber. The Walls of this chamber areformed of rolled or plate iron tightly riveted together, (as boilerplates are riveted,) and have no openings of any kind except theescape-due and the ash-pit and fire-pot openings. This tight box orchamber is to be placed in the compartment in which the air t0 be heatedand distributed is contained, or around it may be built a brick-Workchamberof capacityl tight except at the flue and door openings andentirely surrounding the lire-pot, said tire-pot opening at topdirectlyinto the large llame and smoke chamber andstanding upon theash-pit plates, the fire-pot plates and ash-pit plates being readilydismembered and being, preferably, removable through the door-ways ofthe main chamber for access to the general interior of the chamber. y .i

The drawing represents a furnace embodying my construction. Y

Figure l denotes a horizontal section taken above the lire-pot. Fig. 2``is a front View.` Fig. 3 shows the interior of` the.` furnace-chamberand the fire-pot inclosed by it.

c denotes a large chamber-space formed by six Wall plates or sides, bc de f g. b c denote the top and bottom plates, d e the front and rearplates, and fg the side plates. Extending from the front plate d areshown plates i h forming the door-Way to the ire-pot,and plates iforming the door-Way to the ash-pit, as Well as plates k, which form theoutlet-Hue for escape of the volatile products of combustion, all ofthese plates h z' k, as well as the main plates, being formed of plateiron secured together by riveted joints made i'mpery vious to passage ofgaseous matters. On the bottom plate c is placed a cast-iron ash-pitframe, l, and upon this frame stands a fire-pot frame, m, which may be4surrnounted by a guard, n. The ash-pit frame is open at front and theopening leads directly from the ash-pit door-Way, at the front of whichis the door o. The tire-pot frame m opens at the front into thedoor-way, at the front of which is the re-pot door p. In each of thesedoors a register, q, is placed for controlling admission of air into orthrough the tire-pot, and in the ash-pit frame may be placed a slidedamper controlling air-passages s leading from the ash-pit directly intothe chamber a. The fire-pot and ash-pit frames m t are made detachable,and may stand :in place Without special bolting; and the grate may behung by gudgeons at'its rear end so asv to tip to the front fordischarging the fire-pot. The fire-pot occupies the position seen in thedrawing, and vis entirely surrounded by the close and tight box u, intowhich the flames and volatile products of combustion are forced by thedraft that maintains combustion, and from which after hea-tin g the mainplates such products of combustion escape through the iue. By making alarge-size tire-pot andv urging combustion by the draft (properlyregulating the escape) all the upright and top snrfaces of the mainplates Will be heated, thus making a very 1arge radiating surface forWarming a correspondinglyr large amount of cold air introduced into anair-chamber of which the Walls of the chamber form the infoundimpossible to practically heat by furnaces of ordinary construction.

Instead of making the case ct with a bottom plate, c, forming a iixedpart of the structure, it may be made of the other plates bd cfg, thebottom edges of the plates d cfg being embedded in a cement or othersuitable bottom or door. In the chamber a deector, 1', may be suspendedover the fire-pot to deflect and aid in circulating the flames and otherdirect products of combustion arising from the fire-pot.

I claim- The air-tight chamber, composed of the metal plates rivetedtogether7 and having Within it the removable lire-pot and ash-pitplates, the Whole being constructed and arranged substantially as shownand described.

' W. 0. GROVER.

Vitnesses:

FRANcIs GOULD, M. W. Fno'rHrNGHAM.

